Mirrors_Framework/nuttx
1
0
Fork 0
mirror of https://github.com/apache/nuttx.git synced 2026-06-08 09:51:56 +08:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

risc-v/mpfs: emmcsd: provide options for selecting clk speed

Browse Source 
Some related products, such as Aries m100pfs, don't support eMMC
speeds up to 200MHz. Thus, provide option to select slower clock.
This has only to do with the clocking, no CMD6 is sent to select
high speed modes.

Signed-off-by: Eero Nurkkala <eero.nurkkala@offcode.fi>
This commit is contained in:
Eero Nurkkala
2022-09-12 08:27:44 +03:00
committed by Xiang Xiao
parent 6a01099c59
commit e5305a250a
3 changed files with 41 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/risc-v/src/mpfs/mpfs_emmcsd.c
+33 -5
View File
@@ -97,8 +97,6 @@
#define MPFS_MMC_CLOCK_200MHZ 200000u
#define MPFS_EMMCSD_DEBOUNCE_TIME 0x300000u
#define MPFS_EMMCSD_MODE_LEGACY 0x7u
#define MPFS_EMMCSD_DATA_TIMEOUT 500000
#define MPFS_EMMCSD_SRS10_3_3V_BUS_VOLTAGE (0x7 << 9)
@@ -143,6 +141,12 @@
#define MPFS_EMMCSD_MODE_HS400_ES 0x6u
/* Backwards compatibility with legacy MMC card supports clock frequency up
* to 26MHz and data bus width of 1 bit, 4 bits, and 8 bits.
*/
#define MPFS_EMMCSD_MODE_LEGACY 0x7u
/* Define the Hardware FIFO size */
#define FIFO_SIZE_IN_BYTES 64
@@ -292,7 +296,7 @@ struct mpfs_dev_s
const bool emmc; /* eMMC or SD */
int bus_voltage; /* Bus voltage */
int bus_speed; /* Bus speed */
int bus_speed; /* eMMC Bus speed */
bool jumpers_3v3; /* Jumper settings: 1v8 or 3v3 */
/* Event support */
@@ -1491,9 +1495,22 @@ static bool mpfs_device_reset(struct sdio_dev_s *dev)
/* For the eMMC, use these default values */
priv->bus_voltage = MPFS_EMMCSD_1_8V_BUS_VOLTAGE;
priv->bus_speed = MPFS_EMMCSD_MODE_HS200;
priv->jumpers_3v3 = false;
/* The following defines come from the board.h file */
#if defined(MPFS_EMMC_CLK_200MHZ)
/* MMCSD_CMD6 with 0x03B90200u isn't used here. It's just the clk. */
priv->bus_speed = MPFS_EMMCSD_MODE_HS200;
#elif defined(MPFS_EMMC_CLK_50MHZ)
/* MMCSD_CMD6 with argument 0x03B90100u isn't used here. */
priv->bus_speed = MPFS_EMMCSD_MODE_SDR;
#else
priv->bus_speed = MPFS_EMMCSD_MODE_LEGACY;
#endif
/* Apply proper IOMUX values for the eMMC. This is required especially
* if this NuttX works as the system bootloader. Otherwise, it's
* possible the bootloader has already applied the proper IOMUX values.
@@ -1841,7 +1858,18 @@ static void mpfs_clock(struct sdio_dev_s *dev, enum sdio_clock_e rate)
/* Enable normal MMC operation clocking */
case CLOCK_MMC_TRANSFER:
clckr = MPFS_MMC_CLOCK_200MHZ;
if (priv->bus_speed == MPFS_EMMCSD_MODE_HS200)
{
clckr = MPFS_MMC_CLOCK_200MHZ;
}
else if (priv->bus_speed == MPFS_EMMCSD_MODE_SDR)
{
clckr = MPFS_MMC_CLOCK_50MHZ;
}
else
{
clckr = MPFS_MMC_CLOCK_26MHZ;
}
break;
/* SD normal operation clocking (wide 4-bit mode) */
boards/risc-v/mpfs/icicle/include/board.h
+4
View File
@@ -37,6 +37,10 @@
* Pre-processor Definitions
****************************************************************************/
#if defined(CONFIG_MMCSD_MMCSUPPORT) && defined(CONFIG_MPFS_EMMCSD)
#define MPFS_EMMC_CLK_200MHZ
#endif
/* Clocking TODO: */
#define MPFS_MSS_EXT_SGMII_REF_CLK (125000000UL)
boards/risc-v/mpfs/m100pfsevp/include/board.h
+4
View File
@@ -37,6 +37,10 @@
* Pre-processor Definitions
****************************************************************************/
#if defined(CONFIG_MMCSD_MMCSUPPORT) && defined(CONFIG_MPFS_EMMCSD)
#define MPFS_EMMC_CLK_26MHZ
#endif
#ifdef CONFIG_MPFS_EMMCSD_MUX_GPIO
/* eMMC / SD-card GPIO selection signal */
#define MPFS_EMMCSD_GPIO (GPIO_BANK0 | GPIO_PIN12 | GPIO_OUTPUT | GPIO_BUFFER_ENABLE)